On 2012/6/30 22:28, Alan Stern wrote:
On Sat, 30 Jun 2012, Lan Tianyu wrote:
Have you given any thought to locking? For example, what would happen
if the port power policy were changed at the same time as a new device
was plugged into the port?
Do you mean while a new device was enumerating, the port powered off? I
guess the enumerating process will fail.
That's what I thought too, but I haven't actually tried it. Something
strange might happen when two different threads send concurrent
messages to the same hub port. You might want to do a few experiments.
Ok. I will do some experiments. But I guess it may be hard. Those two
operation maybe too quirk to be simultaneous. :)
What's concurrent messages? I think even from the two threads, messages
will also be processed in the message queue in order. Right?
Alan Stern
--
Best Regards
Tianyu Lan
linux kernel enabling team
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